Punch assembly

ABSTRACT

A punch is installed eccentrically at front end of the cylindrical portion of the punch holder, which is then firmly fixed by means of the crescent-formed seat or split-half hollow cylindrical seat and the clamping block to the inside hole which is furnished at the front end of the ram.

United States Patent 1 1 Lee [ Nov. 4, 1975 PUNCH ASSEMBLY [76]Inventor: Yuan-H0 Lee, No. 85, Jen H0 Road,

Tainan, China /Taiwan [22] Filed: May 29, 1974 21 Appl. No.: 474,219

[52] US. Cl. 83/699; 279/1 L [51] Int. Cl. B26F 1/14; B23B 31/06 [58]Field of Search 83/561, 698, 699; 279/1 L,

[56] References Cited UNITED STATES PATENTS 1,174,309 3/1916 Clermont etal 279/6 3,544,117 12/1970 Bingham 279/1 L Primary ExaminerJ. M. MeisterAssistant ExaminerFred A. Silverberg Attorney, Agent, or Firm-Strauch,Nolan, Neale, Nies & Kurz [57] ABSTRACT A punch is installedeccentrically at front end of the cylindrical portion of the punchholder, which is then firmly fixed by means of the crescent-formed seator split-half hollow cylindrical seat and the clamping block to theinside hole which is furnished at the front end of the ram.

4 Claims, 5 Drawing Figures US. Patent Nov. 4, 1975 Sheet 1 of2 FIG.PRIOR ART PRIOR ART FIG.2

H .1 WEEEEEcEEEEw US. Patent Nov. 4, 1975 Sheet 2 of2 3,916,748

FIG.4

PUNCH ASSEMBLY BACKGROUND OF THE INVENTION This invention relates to apunch of which the aligning of the center is easily performed.

In the prior art, the punch used in a nut forming machine as shown inFIGS. 1 and 2 comprises a front end 1 of the ram, and a'punch holder 2.

Referring to FIGS. 1 and 2, the aligning of the respective punch and diecenter shall be carried out as follows:

First: the adjusting screws located at the right and the left sides ofindividual punch holder 501 and 502, 502 and 503, 503 and 504, togetherwith the set screw 70] have to beloo sened slightly.

Second: when for the sake of adjusting the punch holder to downwarddirection, the following steps are necessary:

1. To loosen the screws 3 located at the central top side of punchholder 2; P

2. To turn both, in equal amount, the screws 401 and 402 at both sidesof screws 3, until the punch holder 2 is lowered down to the desiredposition;

3. To tighten the screws 3, and complete the downward adjustment of thepunch holder.

On the other hand, for the purpose of adjusting punch holder to upwarddirection, the following steps are required:

1. To loosen screws 40] and 402;

2. To tighten the screws 3, until the punch holder 2 is up to thedesired position;

3. To tighten both screws 401 and 402 at both sides of screws 3, andcomplete the upward adjustment of the punch holder.

Furthermore, when adjusting the punch holder toward either the left sideor right side, said punch holder 2 is to be moved to predeterminedposition, by means of either tightening or loosening the screws whichare located in between two adjacent punch holders or in the gap betweenthe punch holder and the flanged portion provided at front end of theram.

Hence, the conventional punch mentioned above is considerablycomplicated in structure and ways of adjustment.

For instance, at least 96 different motions are required to adjust onepunch at a desired position. Moreover, due to the mutual interactionexisting among the individual movement of each related screw, repetitivemotions are required to complete the adjustment. It takes even a skilledworker regularly at least twice work to perform a satisfactory result.

Thus one notes the following deficiencies in the conventional punchmeans:

1. It takes a lot of time to complete the adjustment of the punch;

2. The equal amount of displacement for each individual screw can hardlybe obtained, which results in poor quality of products and lowproduction efficiency.

The main object of this invention is to eliminate the deficienciesmentioned above. Other and further objects, features and advantages ofthe invention will appear more fully from the following description inac companying with the drawings, in which:

FIG. 1 is a fragmentary perspective view partly in section of a punchholder used in the prior art;

FIG. 2 is a plan view of whole set of punch holder used in the priorart;

FIG. 3 is a perspective view of a punch holder of the present invention,with partial sectional view;

FIG. 4 is a front sectional view of the punch holder of the presentinvention, showing how to bring the center of punch up to top of thecenter of die;

FIG. 5 is the same as shown in FIG. 4, showing how to bring the centerof punch down to coincide with the center of die.

Referring to FIG. 3, where 10 denotes front end of the ram, and 11denotes the hole in the ram.

A crescent-formed seat (or split-half of flanged cylindrical seat) 40 isprovided upon the bottom part of the hole 11, which comprises an innerand'outer arc. The center of each arc does not coincide with each othertoward one point, and the flange 41, 42 are formed integrally with bodyat front end and the middle portion of said seat 40, respectively.Furthermore, the flange 41 is connected to the front end of the ram, andlower end of the screws 421, 421 which are threaded in from top side ofthe ram, are against the respective upper sides of the flange 42 whichis located inside the middle portion of the ram. In this way, thesescrews 421, 421' give the seat a certain extent of tilt.

The cylindrical portion 21 of the punchholder 20, is inserted into thespace confined in between hole 11 at front end of the ram and the saidseat 40. The clamping block 50 is then mounted upon top of thecylindrical portion 21 as mentioned before. The inner surface of thesaid clamping block 50 has a properly prepared contour which can befitted without error to the cylindrical portion 21, and two screws 521,521' are being turned in from the top face of the ram, so as to pushdown the clamping block 50 against the cylindrical portion 21, andfirmly set it up. Also, there is a flange 52 which is provided in frontend of the clamping block 50, for proper contact with front surface ofsaid ram. Furthermore, both sides 53, 53 of the clamping block 50 arebeing formed in the shape of arc, so as to maintain the fitting of theclamping block 50 to the cylindrical portion 21 during the oscillatoryadjustment of the clamping block.

At front end of the cylindrical portion 21, the rectangular head 22,with its one side having exactly the same length as the diameter of thecylindrical portion 21, is made in a solid body. And yet, a punch 30 isprovided at right middle portion of said rectangular head 22.

However, the hole 23 is provided for inserting the punch 30 into therectangular head 22, but the center of the said punch 30 is deviatedfrom that of the center of the cylindrical portion 21. On saidrectangular head 22, a groove 24 is out along the horizontal directionat same position of said hole 23. The screws 25, 25 are provided forfastening said punch 30 which is inserted into the said hole 23, so asto secure the punch 30 and the punch holder 20 together.

The measures for aligning the center of punch to that of die, in thepresent invention will become apparent from the following description inreference with FIG. 4.

Referring to the notation in FIG. 4, wherein x denotes the centeringposition of die, while d denotes the center of either hole 11 or seat40. The procedures of carrying out the aligning job in which the centera of punch 30 will be adjusted to fit with the center at of die, areillustrated below;

1. The screws 521, 521 are loosened;

2. The screw 421 is turned in counter-clockwise direction, and the screw421 is turned in clockwise direction, respectively, so as to tilt theseat 40 to the position as shown in two-dot chain line.

it is quite evident that the center of punch holder is shifted to e, andthe center of punch 30 will be displaced from a to b. Therefore, thefirst stage of operation, tilting of the seat 40 and bringing the centerof punch 30 up to the center of dies x can be completed.

3. The punch holder 20 is rotated in an arrowhead direction as shown inFIG. 5. In this way, the punch holder 20 is holding its center at econstantly, and shifting the center of punch from b to 0 (x) so as tocomplete the alignment of the center of punch with that of die x Thepresent invention as illustrated hereinbefore, wherein the additionalexcellent result can also be obtained through the embodiment of presentinvention.

1. Because each of seat 40 and punch holder 20 are given an individualcenter, which constitutes in eccentric way, so that merely by means ofrotating them, the eccentricity of each solid body can be simultaneouslyadjusted, and resulted in completing the alignment of two centers at onetime. Therefore, the advantages of the present invention: simplicity inconstruction, less damage, easy adjustment are readily achieved, and theadjusting job can be done properly by even an unskilled workman.

2. Only 33 different motions are necessary for completion of adjustingjob in the present invention, so as to save working time by 96.698.3% incomparison with the motions required in the prior art.

3. By the embodiment of the present invention, steady and sturdyoperation can be obtained. This will result in. increasing theproduction rate by 40% and the product quality.

It will be understood that although the description mentioned above istaking an example specifically used in a nut forming machine, it canalso be applied to any other type of punch used other than nut former orheading forming machine.

The invention maybe embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is therefore to be considered in all respects as illustrativeand the scope of the invention is indicated by the appended claimsrather than by the foregoing description, and all changes which comewithin the meaning and the range of equivalency of the claim aretherefore intended to be embraced therein.

I claim:

1. A punch mounting assembly and ram for use with a nut forming machineor the like comprising: a cylindrical bore formed in said ram; asemi-cylindrical seat rotatably mounted in said bore; means defining asemicylindrical cavity in said seat; the diameter of saidsemicylindrical cavity being less than that of said seat, the axes ofsaid cavity and seat being essentially parallel but not coincidentwhereby said seat is crescent shaped in cross-section; a cylindricalpunch holder mounted in said cavity, and means for mounting a punch onsaid punch holder on an axis essentially parallel to but noncoincidentwith said axes of said cavity and seat whereby said punch may beadjusted in said ram within a plane normal to the axes of said cavityand seat by independent rotation of said seat and said cylindrical punchholder.

2. The punch mounting assembly as claimed in claim 1 wherein saidsemi-cylindrical seat is mounted within a lower half of said cylindricalbore in said ram.

3. The punch mounting assembly as claimed in claim 1 further comprisingclamping block means for firmly securing said cylindrical punch holderto said seat and said ram.

4. The punch mounting assembly as claimed in claim 1 further comprisingscrew means threaded in said ram for incrementally adjustably rotatingsaid seat about its said axis.

1. A punch mounting assembly and ram for use with a nut forming machineor the like comprising: a cylindrical bore formed in said ram; asemi-cylindrical seat rotatably mounted in said bore; means defining asemi-cylindrical cavity in said seat; the diameter of saidsemi-cylindrical cavity being less than that of said seat, the axes ofsaid cavity and seat being essentially parallel but not coincidentwhereby said seat is crescent shaped in cross-section; a cylindricalpunch holder mounted in said cavity, and means for mounting a punch onsaid punch holder on an axis essentially parallel to but non-coincidentwith said axes of said cavity and seat whereby said punch may beadjusted in said ram within a plane normal to the axes of said cavityand seat by independent rotation of said seat and said cylindrical punchholder.
 2. The punch mounting assembly as claimed in claim 1 whereinsaid semi-cylindrical seat is mounted within a lower half of saidcylindrical bore in said ram.
 3. The punch mounting assembly as claimedin claim 1 further comprising clamping block means for firmly securingsaid cylindrical punch holder to said seat and said ram.
 4. The punchmounting assembly as claimed in claim 1 further comprising screw meansthreaded in said ram for incrementally adjustably rotating said seatabout its said axis.